"rat" task hangs on Windows

[Bruce Schuchardt]

The "rat" task has started hanging on my Windows 7 machine.  I've run 
with & without the gradle daemon and get the same result. With debug 
output it periodically logs this:

14:53:55.907 [DEBUG] [org.gradle.launcher.daemon.server.Daemon] 
DaemonExpirationPeriodicCheck running
14:53:55.908 [DEBUG] 
[org.gradle.launcher.daemon.server.health.DaemonStatus] GC rate: 0.0/s
14:53:55.911 [DEBUG] [org.gradle.cache.internal.DefaultFileLockManager] 
Waiting to acquire shared lock on daemon addresses registry.
14:53:55.912 [DEBUG] [org.gradle.cache.internal.DefaultFileLockManager] 
Lock acquired.
14:53:55.913 [DEBUG] [org.gradle.cache.internal.DefaultFileLockManager] 
Releasing lock on daemon addresses registry.